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This scarcity arises from the intrinsic trade\u2010off between long\u2010wavelength absorption, vibrational broadening, and the structural disorder that typically emerges during disordered aggregation. Here, we introduce SWIR cyanine dyes rationally engineered through controlled steric hindrance, sulfonate\u2010mediated electrostatic interactions, and \u03c0\u2010conjugation design to promote highly ordered J\u2010aggregation. The optimized dye, IRJ1089, assembles into remarkably stable and encapsulation\u2010free J\u2010aggregates, exhibiting high optoacoustic signal generation efficiency and ultra\u2010narrowband absorption at 1089 nm with a FWHM of 164 cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    (19.4 nm). Based on a structural analogue's (IRJ1021) crystallographic data and computational analyses, we propose that electrostatic interlocking between sulfonate groups and the polarized \u03c0\u2010backbone, together with favorable slip\u2010stacking geometry, promotes aggregate order and enhances the J\u2010aggregates\u2019 stability. IRJ1089 J\u2010aggregates support high\u2010contrast multispectral optoacoustic tomography (MSOT) imaging in vasculature deep inside rats (\u223c1.2 cm), enable real\u2010time monitoring of antihypertensive drug\u2010induced aortic dilation, and allow crosstalk\u2010free SWIR multiplexed imaging for diagnosing colorectal cancer\u2010associated intestinal obstruction. These findings establish a generalizable blueprint for designing ultra\u2010narrowband J\u2010aggregating dyes and provide valuable insights into other SWIR photonic materials in multiple areas.\n                  <\/jats:p>","DOI":"10.1002\/adma.73576","type":"journal-article","created":{"date-parts":[[2026,5,30]],"date-time":"2026-05-30T13:56:26Z","timestamp":1780149386000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Formation of Ultra\u2010Narrowband SWIR J\u2010Aggregate Materials and Their Applications in Multispectral Optoacoustic Tomography Imaging"],"prefix":"10.1002","volume":"38","author":[{"given":"Chaobang","family":"Zhang","sequence":"first","affiliation":[{"name":"Biomedical Division State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates School of Materials Science and Engineering South China University of Technology  Guangzhou P. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6739-0694","authenticated-orcid":false,"given":"Shuizhu","family":"Wu","sequence":"additional","affiliation":[{"name":"Biomedical Division State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates School of Materials Science and Engineering South China University of Technology  Guangzhou P. R. 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